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WO1996038290A1 - Sac thermoplastique decoupe a l'emporte-piece a bouche a ouverture facile - Google Patents

Sac thermoplastique decoupe a l'emporte-piece a bouche a ouverture facile Download PDF

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Publication number
WO1996038290A1
WO1996038290A1 PCT/US1996/008000 US9608000W WO9638290A1 WO 1996038290 A1 WO1996038290 A1 WO 1996038290A1 US 9608000 W US9608000 W US 9608000W WO 9638290 A1 WO9638290 A1 WO 9638290A1
Authority
WO
WIPO (PCT)
Prior art keywords
bag mouth
bag
film
die
cut
Prior art date
Application number
PCT/US1996/008000
Other languages
English (en)
Inventor
William P. Belias
Edward M. Bullard
Paul E. Viscontini
Original Assignee
Tenneco Plastics Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tenneco Plastics Company filed Critical Tenneco Plastics Company
Priority to MX9700686A priority Critical patent/MX9700686A/es
Publication of WO1996038290A1 publication Critical patent/WO1996038290A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/007—Details of, or accessories for, sacks or bags for facilitating the separation of the two walls, e.g. walls of inequal height, tabs; for maintaining the mouth of the sack or bag open
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/002—Rolls, strips or like assemblies of bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/86—Forming integral handles or mounting separate handles
    • B31B70/874—Forming integral handles or mounting separate handles involving punching or cutting

Definitions

  • This invention relates to flexible thermoplastic handled sacks, such as bag products dispensed from a roll pack, and a method for separating a blocked, die-cut film bag mouth to provide easy opening.
  • thermoplastic handled grocery sacks are well known and find increasing use as grocery sacks, refuse bags and the like.
  • a common type of thermoplastic handled grocery sack is one made from a gusseted tube sealed at the top and the bottom with a suitable bag mouth and handle cutout, which yields a double layer of film in the handled region.
  • U.S. Patent No. 4,562,925 discloses a conventional thermoplastic bag structure comprising a front and rear bag wall, a bottom and an open mouth top portion, the open mouth portion being characterized by having two pairs of single film handle loops each of which are located at opposite ends of the open mouth portion, the handles of each pair being side-by-side and each handle is an integral single film loop extension of the front and rear bag walls.
  • the bag structures can be unitized by providing a detachable tab at the bag mouth opening and unitizing the bag structures through this tab.
  • the method of forming the bags involves providing an end sealed collapsed thermoplastic film tube and removing plastic to form a bag mouth opening and handles at one end thereof.
  • the resulting bag is an ungusseted bag which can be unitized into a pack by providing a detachable, unitizing tab at the bag mouth opening.
  • U.S. Patent No. 4,790,437 incorporated by reference, teaches a method for forming a thermoplastic film handled bag comprising: forming a continuous collapsed thermoplastic tube having heat seal lines across the width of the tube at bag length intervals, longitudinally folding opposite sides of the heat sealed tube equally towards each other until they meet at a common center line, folding the structure once again in the same direction along the center line and removing eight film layers in one of the corner regions defined by a heat seal line and the spine of the common center line fold, the film removal yielding a bag mouth opening and single loop handles at near the opposite ends of the bag mouth opening.
  • Interconnected bags can be formed into a roll pack.
  • Such roll packs are commonly employed in dispensing thin film plastic bags, usually by including a transverse line of weakened material, such as by perforating the roll or web between individual bags. It has been found, however, that adjacent film layers of typical die-cut bags are difficult to separate. Although die-cut polyolefin film can be fabricated into handled bags at line speeds greater than 150 cycles per minute using conventional smooth die cutting, this operation tends to block the individual film layers together, rendering the bag mouth difficult to open manually. Non-blocking film cutting techniques, such as reciprocal serrating, are significantly slower than die cutting. Summarv of the Invention
  • the present invention is directed to an improvement in handled thermoplastic bag manufacture, wherein the bag is formed by die cutting a multiple film bag structure to form a central mouth portion and integral handles at lateral portions of a collapsed tubular film. Opening of the bag mouth is f cilitated by providing a central mouth portion with roughened edges to obviate film blocking.
  • an improved roll of flexible thermoplastic bags is provided for dispensing handled film bags.
  • the product is made from a rolled collapsed tube web having a series of individual bottom- sealed bags joined top-to-bottom by a transverse perforated tear line of film disposed between the bottom bag seal and a pair of lateral loop handles disposed on opposite sides of a U-shaped bag mouth.
  • the improvement comprises an easy-open bag mouth having opposing major inside edge portions die-cut from adjacent bag walls formed by the collapsed tube of thermoplastic film and forming the inside edges of the lateral handles; and a minor bag mouth edge portion centrally located between the opposing major edge portions, said minor bag mouth edge portion comprising a torn perforation line formed by tearing scrap thermoplastic film from the die-cut bag mouth.
  • This technique provides a series of torn film edge discontinuities in the perforated minor bag mouth edge portion to facilitate separation of blocked adjacent film layers during opening of the bag mouth.
  • the collapsed tube is produced by extruding a polymeric material , such as low density polyethylene, high density polyethylene (HDPE), linear low density polyethylene (LLDPE) and blends thereof.
  • a polymeric material such as low density polyethylene, high density polyethylene (HDPE), linear low density polyethylene (LLDPE) and blends thereof.
  • Fig. 1 is a plan view of a collapsed thermoplastic tube
  • Fig. 2 is a plan view of the sealed tube of Fig. 1 with opposite sides folded equally inwardly;
  • Fig. 3 is a plan view of the folded sealed tube of Fig. 2 having cut out portions to produce bag mouth regions and integral bag handles for a plurality of bags;
  • Fig. 4 is a plan view of the folded sealed tube having cut out portions to produce bag mouth and integral bag handles of Fig. 3 with opposite sides folded equally inwardly;
  • Fig. 5 presents the Fig. 4 embodiment in roll form
  • Fig. 6 is a plan view of a single detached bag fully unfolded to show the handles and bag mouth regions of a bag;
  • Fig. 7 is an enlarged view of a portion of the bag mouth.
  • thermoplastic film tube It is well known in the plastics art to continuously melt extrude thermoplastic resin through an annular orifice, apply internal fluid pressure to the tube thus extruded and thereby expand the tube and reduce the wall thickness thereof to appropriate dimensions while cooling and solidifying the extruded thermoplastic film.
  • This technique and any equivalent technique of forming a thermoplastic film tube can be employed in providing the starting material for the bags and bag packs of the present invention.
  • the contemplated thermoplastic film can be of any type having the characteristics necessary for a handled bag which will be required to carry items totaling up to about 45 lbs. or more. While not limited to the polyolefins, these materials have proven in the past to be excellent films from which bags can be made.
  • Preferred materials include polyethylene, generically and, specifically, low density polyethylene, high density polyethylene, including high molecular, high density polyethylene, linear low density ethylene copolymerized with a C 4 -C 8 alpha olefin and blends and coextrusions of these materials.
  • the polyethylenes can be blended with certain aromatic polymers in order to impart special desirable physical characteristics thereto.
  • Linear low density polyethylene can be blended with up to about 10% by weight of polystyrene.
  • Suitable examples of a commercially available polyolefin material suitable for use in the present invention include high density homopolymer polyethylene (HDPE) or linear low density polyethylene
  • LLPDE which comprises ethylene copolymerized with from about 2 to about 7 wt. % of octene-1.
  • the polyolefin is melt extruded through an annular orifice and blown up to a tube which will have a lay flat diameter of approximately 60 cm
  • the sides 26 are seamless and the ends 12 are heat-sealed.
  • Heat-seal 12 constitutes a thermal merging of the two films of the collapsed tube.
  • the seals 12 can be made so that they simultaneously seal and sever through the films or the seals may be made not to sever through but merely weaken the region adjacent to line 12 so they may be subsequently severed with comparatively little force.
  • another technique which is particularly preferred is to provide pairs of relatively closely spaced heat seals 12, the spacing generally on the order of about one-half to one inch between individual heat seals 12.
  • a transverse line of weakness or perforation line 14 effective to permit individual bags to be severed with relatively little force. This technique is preferred because the next step of the method of the present invention requires that the seamless sides of the tube 26 be folded over in a continuous process, as shown at 16 of Fig.
  • the degree of foldover is related to the ultimate width of the desired handles.
  • the individual handle widths can range anywhere from about 10-20 cm, preferably from about 12-18 cm.
  • the side-to-side dimension of the lay-flat tube will be approximately 75 cm (30 inches).
  • the side-folded, sealed and perforated structures are serially provided with cut-out regions 18 by the use of a suitable cutting mechanism, the handles and bag mouth opening thus formed by the removal of plastic film from cut-out region 18.
  • a suitable cutting mechanism it is necessary, in order to create the carrying handles of the present invention, to open the upper left and right sides of the structures as at 32 (see Fig. 6). This is uniquely accomplished by having the side-folded regions 18 extend far enough into the cut-out region 18 for each bag.
  • the cutting member which thus remove a hand- accommodating slice from each pillowcase structure to yield openings at 32. As with the portion removed from the region between the handles, this portion can be returned for recycle as usable resin material.
  • a preferred embodiment of the present invention includes the use of a handle/bag mouth cutout of a more complex design.
  • the handles and bag mouth opening show that at the base of the handles there are stress relief regions 28 which function to cause stress forces which ordinarily would be brought to bear along bag mouth line 30 to concentrate at points below this line. Thus, stress forces will literally extend through the film space between the bottoms of the arcs of stress relief regions 28.
  • the preferred handled bags of the present invention are relatively large bags.
  • Figs. 4 and 5 in forming handle- containing bags in roll-form, such as is illustrated in Fig. 5, the marginal edges of the tube are once again folded inwardly toward each other to form folded regions 20. Then, the twice folded tube structure is convolutely winded to form severable bags on a roll 22.
  • a bag of the present structure makes maximum use of the potential volume of the original collapsed cylinder.
  • the die-cut mouth has a relatively short central portion having a discontinuous edge segment (see enlarged view Fig. 7) adapted for easy manual opening.
  • the opposing handles 32 and side portions 31 of the bag mouth are preferably smooth die-cut.
  • the preferred large volume bags of the present invention will find utility in a wide variety of both home and industrial applications, including the disposal of leaves and yard refuse, garbage, debris, etc.
  • the bag handles may be tied together to close the bag, eliminating the need for bag ties of the type typically employed.
  • the ungusseted construction of the bag bottom provides excellent leak resistance.
  • the handle portion of a bag In preferred embodiment of the invention, the handle portion of a bag.
  • the handle seal is separated from the adjacent bottom seal by a transverse weakened portion formed as a linear series of uniform perforations having predetermined slit length and extending across the bag handles. At least one extended edge perforation or nick is cut in the perforation line at the handle edges for the purpose of initiating the tearing action.
  • Bags held together by perforations wound on a roll are dispensed by the consumer one at a time by un-rolling and tearing the perforation lines adjacent the bag handles.
  • the ratio of non-cut vs. slit cut in a perforation line determines in-process perforation strength.
  • FIG. 7 an enlarged segment of the bag mouth portion 130 is depicted prior to removal of die-cut scrap 118.
  • a minor bag mouth edge portion is provided centrally located between the opposing major smooth die-cut edge portions 131 between the bag handles for ease of separation.
  • This minor bag mouth edge portion 130 comprises a perforation line having a uniform series of slits 136 of predetermined length (ie - about 0.5 to 2 cm.) and ratio (ie
  • the land portions 138 result in a spaced series of small tabs formed by tearing scrap thermoplastic film 118 from the die- cut bag mouth 130; thereby providing a series of torn film edge discontinuities in the perforated minor bag mouth edge portion to facilitate separation of blocked adjacent film layers during opening of the bag mouth.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Making Paper Articles (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)

Abstract

Un rouleau de sacs en plastique à poignée est formé à partir d'un tube continu applati. Chaque sac est délimité par deux thermosoudures espacées longidutinalement et peut être séparé du rouleau le long de lignes perforées. Les poignées (32) et la bouche (30) du sac sont formées par découpage du tube à l'emporte-pièce. On obtient une meilleure séparation des couches de film par perforation d'une petite partie de bordure de la bouche du sac située centralement entre les grandes parties de bordure lisses intérieures opposées, et déchirure du film thermoplastique de chute de la bouche du sac découpée à l'emporte-pièce, afin de produire un bord brut présentant une série de parties discontinues de bordure de film déchirées facilitant la séparation de couches de film adjacentes bloquées pendant l'ouverture de la bouche du sac.
PCT/US1996/008000 1995-05-31 1996-05-30 Sac thermoplastique decoupe a l'emporte-piece a bouche a ouverture facile WO1996038290A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
MX9700686A MX9700686A (es) 1995-05-31 1996-05-30 Bolsa termoplastica cortada con troquel, con boca que se abre facilmente.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US45575495A 1995-05-31 1995-05-31
US08/455,754 1995-05-31

Publications (1)

Publication Number Publication Date
WO1996038290A1 true WO1996038290A1 (fr) 1996-12-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/008000 WO1996038290A1 (fr) 1995-05-31 1996-05-30 Sac thermoplastique decoupe a l'emporte-piece a bouche a ouverture facile

Country Status (3)

Country Link
CA (1) CA2196414A1 (fr)
MX (1) MX9700686A (fr)
WO (1) WO1996038290A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5935367A (en) * 1996-12-11 1999-08-10 Tenneco Packaging Inc. Apparatus and method for forming handles in plastic bags
US5967663A (en) * 1996-03-26 1999-10-19 Tenneco Packaging Inc. Thermoplastic bag structure
WO2000009409A1 (fr) * 1998-08-12 2000-02-24 Supreme Plastics Group Limited Sacs et pochettes a fermeture par pression
EP1662293A1 (fr) * 2004-11-26 2006-05-31 EFALOCK Professional Tools GmbH Elément protectif pour protéger une branche de lunettes
CN106346837A (zh) * 2016-01-05 2017-01-25 邓明进 具提把袋子的零或少废料制法
USD835518S1 (en) 2012-04-18 2018-12-11 Texas Ice Express, LLC Bag closure construction
USD900628S1 (en) 2019-04-23 2020-11-03 Checker Food Products Company Plastic bag with perforations
USD900627S1 (en) 2019-04-23 2020-11-03 Checker Food Products Company Plastic bag with perforations
CN112512935A (zh) * 2018-09-20 2021-03-16 福瑞托-雷贸易公司股份有限公司 包装食品

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0433689A1 (fr) * 1989-12-22 1991-06-26 A.W.A.X. PROGETTAZIONE E RICERCA S.r.l. Sac à poignée en film plastique
US5056931A (en) * 1989-07-14 1991-10-15 First Brands Corporation Thermoplastic handled bags and their method of manufacture

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5056931A (en) * 1989-07-14 1991-10-15 First Brands Corporation Thermoplastic handled bags and their method of manufacture
EP0433689A1 (fr) * 1989-12-22 1991-06-26 A.W.A.X. PROGETTAZIONE E RICERCA S.r.l. Sac à poignée en film plastique

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5967663A (en) * 1996-03-26 1999-10-19 Tenneco Packaging Inc. Thermoplastic bag structure
US5935367A (en) * 1996-12-11 1999-08-10 Tenneco Packaging Inc. Apparatus and method for forming handles in plastic bags
WO2000009409A1 (fr) * 1998-08-12 2000-02-24 Supreme Plastics Group Limited Sacs et pochettes a fermeture par pression
EP1662293A1 (fr) * 2004-11-26 2006-05-31 EFALOCK Professional Tools GmbH Elément protectif pour protéger une branche de lunettes
USD835518S1 (en) 2012-04-18 2018-12-11 Texas Ice Express, LLC Bag closure construction
USD863976S1 (en) 2012-04-18 2019-10-22 Texas Ice Express, LLC Bag closure construction
USD926590S1 (en) 2012-04-18 2021-08-03 Mexico Plastic Company Bag closure construction
CN106346837A (zh) * 2016-01-05 2017-01-25 邓明进 具提把袋子的零或少废料制法
TWI611916B (zh) * 2016-01-05 2018-01-21 Deng Ming Jin 具提把袋子之零或少廢料製法
CN112512935A (zh) * 2018-09-20 2021-03-16 福瑞托-雷贸易公司股份有限公司 包装食品
USD900628S1 (en) 2019-04-23 2020-11-03 Checker Food Products Company Plastic bag with perforations
USD900627S1 (en) 2019-04-23 2020-11-03 Checker Food Products Company Plastic bag with perforations

Also Published As

Publication number Publication date
MX9700686A (es) 1997-04-30
CA2196414A1 (fr) 1996-12-05

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